Triad Aeromodelers, Inc.
AMA CHARTER 3467 |
If anyone has anything new they would like included in our Web Page please let me know. You can email me by clicking here.
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Here is a good CG Calculator but it doesn't work on the NP of Bi-planes |
By Dave Scott. Instructor, 1st U.S. R/C Flight School |
If you have a bolt that you are having trouble with the size, try looking on this chart. It might be Metric and this chart will help you find the correct bolt to try. |
Larry has found the best site for Calculating "Center of Gravity " _______ "Wing Loading" "Motor and Prop Combo" ________ " Propeller Static Thrust" I will also add a link to https://rcplanes.online on our Links Page |
How to setup your triadaero emailThe link #1 will help you setup a POP3 email on your PC, MAC, Iphone, Ipad, or Android device. If you would rather use IMAPI that is there also. You can also use your triadaero email as a webmail by logging in using link #2. If you have a problem call Danny Voyles from your roster. #1 http://www.networksolutions.com/support/step-by-step-pop-setup-instructions #2 https://webmail.networksolutionsemail.com The actual length of this address will not fit on one line so i shorten it it what is shown here
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To download aTrim Chart in PDF format click here and then click SAVE AS in the PDF reader to save to your computer or phone.. |
Would you like to know why this is bad, especially for us new pilots? Would you like to fix that one model you have that is prone to tip stalls? Then click this picture and see what the AMA and Dave Scott have to say about it. ![]() |
Calculate minimum servo requirements
The equation that is used to establish the minimum torque required for each control surface is as follows: Tmin = [A x (chord x span) x (chord/3) ] x (servo arm / control arm) Where: Armed with the minimum servo torque values, suitable servos can be selected and bought for each application. It's typically to go for a servo that provides approximately 1.5 times the minimum requirement specified to ensure plenty of performance margin.
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Balancing Biplanes — Finding the CG Range for Safe Flights When it comes to RC airplanes, I am of the “two sets of wings are better than one” kind of guys. For any model to perform properly and be safe to fly, it has to be properly balanced. This is especially true for multi-wing models. As a basic rule, you first find the MAC or “Mean Aerodynamic Chord” of your biplane, then establish the CG Range from there. If you are building a kit or assembling an ARF, start where the instructions indicate. If you don’t have the information of it looks weird somehow, compute the range and see for yourself. Manufacturers have been known to get the numbers wrong. Why find the range? The CG Balance works in both directions. You model can be too nose heavy or too tail heavy. Nose heaviness leads to less elevator authority and increases landing speeds while making it harder to flare to bleed off speed. Tail heaviness lessens stability and increases pitch responsiveness. Sometimes to the point where you loose control. So find the limits for your model’s 25 to 33 percent sweet spot range and then work from there by doing test flights to check how your biplane responds. (Above) the Pitts Special is a common aerobatic biplane and it has a swept back top wing. The illustration below shows how to find the MAC and thus your 25 and 33 percent MAC locations for the CG range. (Above) The Albatross D.III is a prime example of a plane with larger top wing than its lower wing. The Illustration below, shows the side view illustration for finding the model’s Center of Lift (CL). Placing the CG forward or aft of the CL effects the model’s performance. The area of the top wing is 57% of the area of both wings and it has a positive stager. These techniques for finding the center of lift and the MAC and CG locations for Biplanes have worked on several different models. They are meant to get you into the ballpark so you can perform a safe and controllable test flight. After you fly your model, you can make fine adjustments to dial in the balance point that you are most comfortable with.
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Pull Pull System TAI Members, To get it on your computer, click here to download zip file into a folder. Open the .zip file and then un-compress the program by dragging and dropping the PullPull.exe file into the same folder. Then run the program. Let me know if you need some help. Good Luck and Happy Landings!!!
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How to Apply UltraCote
Surface Preparation: |
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Pro Tip - Some professional builders "raise the grain" then sand a second time with 320 or 400 grit paper for the ultimate finish. After the model is sanded, use a damp cloth to wipe down the model. Some modelers prefer to use a fine-mist squirt bottle filled with water to dampen the surfaces to be covered. As the surface dries, imbedded wood fibers in the surface will "stand up." When dry, sand the surfaces again using 320 or 400 grit paper. Raising the grain now and sanding it off will prevent the grain from raising later under the covering, creating a bumpy finish. Vacuum the model thoroughly and avoid touching the model with oily hands.Your model is now ready for covering! |
Trim Film to Size: |
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Pro Tip - If the iron you're using does not display the actual temperature, here is a tip that will ensure your iron is properly set.Water boils at 212°F. Allow your iron to warm up at a medium setting. When the iron reaches its stabilized temperature, carefully pour a few drops of water on the iron's surface. Adjust the temperature until the water just begins to boil off. This method is surprisingly accurate and is generally within 10°(of the exact application temperature of 220). |
Tacking Covering to Spar: |
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Covering a Solid-Sheeted Wing: |
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Covering an Open-Structure Wing: |
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Sealing the Edges: |
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Wing Tip: |
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Pro Tip - If sealing the covering in tight areas such as corners or fillets, using the Hanger 9 ProTrim Sealing Tool is very helpful and results in a professional finish. |
Covering the Top of the Wing: |
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Shrinking the Covering: |
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Pro Tip - Use heat, not pressure, to shrink the covering taught. If pressure is applied, gouges can be pressed into the wood. Let heat, not pressure, do the work. |
Covering Fuselages and Other Solid Surfaces: |
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Important: Even if you're experienced in applying other brands of covering, it’s important to read the following instructions. UltraCote® incorporates a unique multi temperature controlled adhesive and shrinkage system that makes achieving professional covering results easy. |
Multi-Temperature Control System: |
Application Tempature-220°F (100°C): |
Pro Tip -Many professional builders mark this temperature on their covering iron with a marker or striping tape for quick reference, as this temperature is used frequently whenever putting on covering. |
Shrink On-Set Temperature-300°F (134°C) |
Maximum Shrinkage Temperature-350°F (162°C) |
Last Update Friday February 12, 2021 9:34 AM